Telegraphone.



Drafisman.

17s. TELEPHONY,

BEST AVAILABLE COP MMr * No. 789,336. v PATENTED MAY 9, 1905.

v. POULSEN, P. 0. PEDERSEN & 0. $011011.

TELEGRAPHONB.

APPLICATION FILED SEPT. 2, 1902.

6 8HEBTS-SHEBT 1 3 Pay/6e71, HQ gtgvel gg l'l'oznm SCho WQJELEPHQNm v g'9' /4 Q "BEST AVNLABLE COP 110.789.5336. PATENTED MAY 9, 1905. v.POULSEN, P. 0. PBDERSEN & 0. SOHOU. TELBGRAPHONB.

APPLICATION FILED SEPT. 2, 1902.

6 SHEETS-SHEET 2.

IIIIIIIIIIIIHIIII II lllwm l l'r lut m l TELEPHONY 1 U 0. BEST AVAILABLECOP PATENTED MAY 9, 1905.

V. POULSBN, P. O. PEDBRSEN & G. SGHOU. TBLBGRAPHONB.

APPLICATION FILED SEPT. 2, 1902.

at), w a M ss'r AVAiLABLE COP No. 789,336. PATENTED MAY 9, 1905. V.POULSEN, P. 0. PBDERSBN & G. SOHOU.

TELBGRAPHONB.

APPLICATION FILED SEPT. 2, 1902.

6 SHEETS-SHEET 4 514001415065 uZerJen 4 Cwrl, Jchou AN L f x BEST AVNLABLE COP No. 789,336. PATENTED MAY 9, 1905. V. POULSEN, P. 0. PBDBRSBN& G. SGHOU.

TELEGRAPHONB.

APPLICATION FILED SEPT. 2, 1902.

e SHEETS-SHEBT e flkbw W WWW New ' 'atented May 9, 1 90%.

BEST AVAILABLE CO UNiTED STATES PATENT Orrica.

VALDEb'lAR POULSEN, PEDER O. PEDERSEN, AND CARL SCHOU, OF COPEN H AG EN,DENMARK.

TELEGRAPHONE.

SPECIFICATION forming part of Letters Patent No. 789,336, dated May 9,1905.

Application filed September 2, 1902. Serial No. 121,793.

.7 -11. whom it nu/,1 concern:

Be it known that we, VALDEMAR PoULsnN,

Phone 0. PnDnnsnN, and CARL Sonou, sub- Thisinvention relates to tele'ra bones, and 1 b r is designed as a general improvement upon theinstrument described in United States Patent- No. 661,619, i sued to V.Poulsen November l3. i900.

The improvements herein relate more especially to the matter ofobtaining a machine capable of receiving 'a large or long record whichshall at the same time be comparatively small and compact in structure.

It is also an object of the invention to provide a machine in which theobl i t;3 1 ati on of an oid Qllflfiifgqttired record is accomplishedsieousl y "wi'tli"tiie r ,ltlii' s rendering a iintessar vtonvm for thecomplete. obliteration of a record hefore making a new one.

It is a further object of the invention to provide nieansForautomatically starting and I stopping themaehine as well as for manuallystarting, stopping, and reversing it.

A further object is to provide means for readily determiaing on whatportions of the record-body tlrvarious parts or sections of the recordedmatter are located, so that they may be readily found for reproduction.

1n carryingeut these objects the invention involves variousconstructions and combinations thereof, all of which will be described,and particularly. pointed out inthe claims.

In .theaccompanying drawings, Figure 1 represents a front elevation ofthe improved tciegraphone. F ig. 2 is a plan of the same. Fig; 3 is arear elevation with the rear wall of e casing removed. Fig. i isasection on line :w a; of Fig. .2, showing only the upper Part of themachine. Fig. :3 is a sideelevationot one of the feedcams. Figs. 6 and 7are details of the indicator- Fig. 8 is a detail of a switche itism Fig.11 is a side elevation of the starting and stopping relay, showing thecase thereof in Fig.

section. Fig. 12 is a plan of the same. 13 is a plan of the case of therelay with portions broken away; and Fig. Pi is a view of The form oftelegraphone herein described is that in which the body onwhieh therecord is made is a loose wire which is wound back and forth from onereel to another, the recording and reproducing magnet being located in aposition to act upon that part of the wire between the two reels orspools and electric motors being utilized to drive the spools.

Referring to the drawings by letter, A. indicates a box or easing ofrectangular shape, in which are located two electromotors B and B.placed side by side with-their shafts parallel to each other and eachshaft carrying a disk or rotating part ,7), against which the brakeshoecan bear to stop the motor after thee-urrent is out d. The brake-sh areindicated by 6' and 1 They are carried, respectively, by the levers bpivoted at b", and each acted upon by a spring 12", which tends to applythe brake. For releasing the brake there is provided an electromagnet 0,mounted between two lovers in a position to attract armatures 7),carried by each lever, and hold the shoes off against the force of thesprings.

(2 is a lever pivoted in the end of a post at its middle point andprovided at each end the same time goes into engagement with the otherlever/i to hold that brake in the released position.

On. the top plate of the box A is frame ceir-isting of tw \ndards I) lin whichare hatter/amid. Uncach shaft is a grooved pulley (Z so that theshafts may be respectively rotated by the electric motors through thebelts (Z On each of the shafts Ll (Z is a spool or reel 0 0', they beingconnected with the shaft by a spline, so as to partake of the rotarymotion of the shaft and at the same time slide longitudinally thereon.The hub of each spool projects at one end and has an annular groove 0 toreceive the forked end of a shifting-arm a. Each shifting-arm isattached to a sleeve 6*, adapted to slide upon a rod 0", suitablymounted on the top plate of the casing, there being two of these rods,one for each shifting device. Paralled to each rod is a large disk f,which together with its worm-wheel f is mounted upon a fixed short shaftg suitably supported immediately above the top plate of the casing A andat right angles to the rod 0 The two disks f f are rotated independentlyof each other through respective worm-gears f f by the two worm-shafts fj one of which is driven from the shaft rl through the pinion (Z andgear f while the other is driven from the shaft (Z' through the pinion(Z and gear f. Each of the disks ff have in their faces heartshapedcam-grooves f which are reversed with respect to each other and whichare located on the faces adjacent to the respective rods 6 The sleeve eon each rod carries a pin 6 which enters the groove f of its particularcam. It will now be seen that when the disks are rotated togetherthrough the gearing above described the sleeves e, the arms 6 and thespools e and 0' will be reciprocated in opposite directions, each spoolon reaching the end of its shaft (Z or (1 having its movement reversed,and it will be seen that if a wire is at the same time unwound from onespool and wound upon the other the strand extending from spool to spoolwill always occupy the same vertical plane along themiddle of themachine substantially coincident with the line a: wpf Fig. 2 and that byreason of the opposing reciprocation of the spools aneven layer of wirewill be laid upon one spool as it is removed from the other. The onlyalteration of position of the strand extending from spool to spool willbe a slight vertical incline from one spool to the other, due to theincrease of diameter of the coil on one spool and the decrease of thecoil on the other. r

The two standards D D are connected across the top and at the middle bya bridge-piece D, and across the middle of this is mounted amagnet-carrizr g, which is pivoted on the points 9, so as to tilt up anddown toward the spools on each side. The wire carried by the spools andwhich serves as a record-receiving body passes through two eyes g one oneach side of the carr er and along its middle line, so that as thediameters of the two spoOlS change the incline of the strand on itsway,f"om.=;a-- a spool to the other will be a commodated by the tiltingof the carriers-z 1 BEST AVAILABLE coP" thus permit the wire to continuein a direct line. The carrier supports the electromagnetic recording,reproducing, and obliterating device, consisting of the equivalent ofthree magnets, the magnet m being in the middle and m and mrespectively, on each side. As shown in Fig. 2, there are apparently sixmagnets, three on each side of the wire; but these are the equivalent ofthree magnets, since the north and south poles stand opposite eachother, and the coils of each pair are connected in series. The middlemagnet is the recording and reproducing magnet and also carries thepolarization-coil, while the magnets on each side are for obliteratingthe record, one of them being active while the wire is passing fromright to left and the other active while the wire is passing from leftto right, so that the wire will be clean when 'itis presented to themiddle or recording magnet for a new record.

Referring now to the indicating mechau:

ism, it will be seen that one of the cam-disks f is provided on itsperiphery with a slow screw-thread or worm, which engages with aworm-wheel 72,, carried by a shaft h, which projects through the frontwall of the casing A. On its outer end the shaft is fitted with an index2 which plays in front of a scale I and carries two projections 9 and i.This arm must move over the scale in proportion to the movements of theremainder of the machine, 'inasmuchas it is driven from one of therotating parts of the machine. Upon the face of the scale are arrangedtwo metallic contact-plates j and j, which extend the length of thescale. In front of the scale is a protecting glass cover It, throughwhich the sleeve Z projects and has its bearing. This sleeve is fittedon the outside with a thumbnut Z and on the inside carries an index-armZ which can be placed at any desired position on the scale by turningthenut Z. The said arm carries a metallic finger Z which is always incontact with the plate j. This finger is insulated from the arm, asshown in Fig. 7,- but has an extension Z, opposite which stands aspring-rod Z normally out of contact therewith, but secured to and inelectrical contact with the arm Z When this spring-rod Z is pressedagainst the projection Z, the circuit is closed between the plate andthe arm Z and this closure takes place when the index has moved to aposition adjacent to the arm Z where the projection i pushes rod Z intocontact with Z. Passing through the sleeve Z and having its bearingtherein is a short shaft 0, having a thumb-nut 0' on its outer end andcarrying an arm 0 on its inner end, similar in construction to Z but itscontact-finger Z is in connection with the plate j. so that when theprojection e" of the arm 2' acts it will close the circuit between theplate 1' and t e arm 0 Arms 0 and Z are electric- 'in "I contact witheach other and the circuit leads from them through the spring-finger Onthe front of the, box is a handswitch 1) for reversing the machine andwhich may also be used for stopping and starting. This switch consistsof a lever having two bridge-bars p and 79 (see Fig. 8,) adapted toconnect in pairs four terminals arranged at the right and left handpositions' 9 is insulated from the lever.

The lZGlGg'IRPlIODE is adapted to be used locall y or connected with atelephone-subscribers circuit at will, and for this purpose it isprovided with the necessary switch apparatus to control it under bothconditions. When used locally, the instrument is entirely disconnectedfrom the telephone-line by an ordinary switch, as hereinafter described.Locally the machine would be used'for dictating correspondence and othermatter which requires that convenient means he provided for starting,stopping, and reversing the machine readily and at the same timethrowing the telephone transmitter and receiver in, as well as therecording and reproducing magnet, the obliterating-magnets, and thebrake. For starting and stopping the machine locally a local source ofcurrent, such as a battery, is used.

The invention includes a relay apparatus by which the machine can bestarted and stopped locally by hand with the aid of a local battery,which will now be described with particular reference to Figs. 11, 12,and 13. The relay is preferably in a suitable box Q independent of thetelegraphone, the box consisting of a base q, having a cover g. Itcontains two relay-magnets R and S and a locking-magnet T. Magnet R actsupon an armature r, carried at one end of a pivoted .4

lever 0 whose other end-is connected with a 7 spring r which opposes thepull of the magnet. The lever 'r carries a U-shaped vessel 1 R ofinsulating material, such as glass, the

' two chambers in the arms or ends of the ves sel being connectedtogether by a cross-tube r" of restricted diameter. This vesselcontainsaquantity of mercury, which is adapted to flow from the chamberon one end to that on the other when the vessel is tilted by the magnetor by the spring; but owing to the restriction of the tube 1' itrequires a certain interval of time for the mercury to empty from onechamber into the other. Into each of the end chambers a pair ofelectrodes 2- and r respectively, project, their position being suchthat when all of the mercury has flowed into one chamber the electrodesare immersed and electrically connected, while the other electrodes aredisconnected from each other. The device therefore becomes aretarding-switch and is used herein to afi'ord certain other parts ofthe apparatus time to operate before the circuits are changed bythemercury. The magnet S acts upon an armature 8, connected to oneREM-240E a pivoted lever .9, whose opposite two coilst and t,respectively.

end is acted upon by a spring s in opposition to the magnet. Acontact-spring s is arranged to make connection with a point .9 on thelever when the magnet lifts the lever. T is an electromagnet upon whichare wound lts armature t is attached to a pivoted lever t, whose freeend is adapted to be projected under the end of lever s by the spring 6when said lever s has been lifted to close the circuit at s a, and whenmagnet T is energized by either of its coils it withdraws the lever andallows lever s to fall and break the circuit at .v and .9. To the coverof the box Q is fixed a contact-spring u, normally resting in contactwith an insulated plate u, but adapted to be forced out of contacttherewith and into contact with a second spring-plate a by means of apush rod or buttonu, projecting through the top of the box. On the topof the box also there is mounted a switch-lever '0, of conductingmaterial, adapted to connect when in one of its positions with threeterminals 0;, Q12, and o and when in the other position with a terminalof. At the left end of Fig 13 and in Fig. Qplates andbinding-screwsareshown, the purpose of which is merely to form thenecessary connections for the various wires and circuits hereinafterdescribed and need no special description. An induction-coil ees?AVAlLABLE cor which forms part of an ordinary telephone set is placedfor convenience in the box Q at W.

Fig. 14 shows a convenient disposition of the telegraphone, the relay,and the accompanying telephone set on a table. Such an arrangement wouldbe suitable for dictation pu rposes, as the person dictating could sitin front of the transmitter and manipulate the starting and stoppingrelay with one hand and the reversing-switch p with the other, while atthe same time the indicator would be plainly in sight to show whatportions of thewire the various matters dictated are recorded upon. Themain switch (indicated by w w) is also at hand to connect thetelegraphone with the regular telephone system in order to receive andrecord a message sent from a distance over the regulartelephone-circuit, this feature, however, having nothing to do with thepresent invention.

The circuits will he described in connection with the description of theoperation, which now follows: At the left of Fig. 10 there is shown aconnection or distributing hoard containing the switch w w, and thevarious bindingposts by means of which the different sources of currentare connected with their LIO Best AVAlLABLE coetirely separated from thetelegraphone and ating-magnets, the. particular magnet being may be usedin the ordinary way without reference to the telegraphone. Thetelephonecircuit leads in from central otlice by wire 1, thence to thetelephone set by wire 2, and back through wire 3, switch-arm w, and wire4 to central oiiice. With the relay in the position shown in Fig. thetelegraphone is running, because the circuit is closed through one ofthe motors as follows: Commencing at the positive side of thepower-circuit, the current flows by wire 5, wire 6, brakemagnet 0, wire7, brake-magnet 0 wire 8, mot-or B',wire 9, switch-armp,wire 10,speedreducing resistance 11, wire 12, wire 13, relay R, wires 14 and 15,contactss and 8 wire 16, and wire 17 to the source of power. Motor B isactive, and the wire is being wound upon the spool which it drives,motor B being inactive electrically, but rotating on account of themechanical connection through the belts and gearing. Both brakes areheld 08', because the magnet c is energized. Magnet 0 being energized,the locking-lever c is in engagement with thebrake-leve of motor B, sothat when the circuit is opened to stop the machine the brake on themotor B is the one which is allowed to go into operation under itsspring 7). This is necessary, because the retarding of the pulling-motorwould cause slack to accumulate in the wire, whereas by braking theinactive motor tension is maintained on the wire until the machinestops. 'While the machine is thus running a record may be placed on thewire by speaking in the transmitter Y, or the machine may be reproducinga record,which can be listened to at the receiver X. If a record isbeing made, the switch 0 is in the right-hand position, and the voiceoperates over the following circuits: first, over theprimarytransmitter-circuit, which begins at the transmitter-battery and leadsby wires 18 19 to the primary of the induction-coil W, wire 20, switch'0, wires 21 22, transmitter, wires 23, 24, and 25 to battery. Thesecondary circuit is then as follows: from the secondary of theinduction-coil by wires 26 27, relay S, wires 28 29 30, recording-magnetm, wires 31 32, coil 6 of locking-magnet T, wires 33 34 35, switch-armw, wires 36 37, contacts at and a, switch-arm c, wires 52 and 41 to thesecondary. Thus the undulations of current created by the voice willtraverse the recording-magnet and a record will be made upon the wire.is being made a polarization-current flows through a separate coil onthe recordingmagnet for the purpose of bringing the wire to the mostfavorable condition to receive the recording magnetism, as fullydescribed in the application, Serial No. 111,305. filed June 12, 1902,by V. Poulsen and P. O. Pedersen. y-This kit-cuit is traced as follows,and

includes, as will be seen, orie of the oblite At the same time that thisrecord the one which precedes the recording-magnet, determined by thedirection of movement of the wire for the purpose of obliterating anyrecord that may be on the wire before it reaches the recording-magnet:from the polarizing and obliterating battery by wires 42 43 44,obliterating-magnet m, wire 45, switch-arm p, wires 46 47,recording-magnet wt, wires 48 49, switch-arm w, wires 21, 50, and 51back to the battery. It instead of making a record one is beingreproduced, the switch c is then in the left hand position, which, itwill be seen, at once opens the polarizing and obliterating circuit andcloses the receiver-circuit through the recording-magnetzbeginning withthe recording-magnet, which is then the source of current, by wires 3132, coil t of locking-magnet T, wires 33 34 35, switch-arm 10, wires 3637, contacts u and a, wires 38 39, receiver X, wires 52, switch-arm 01,wires 53 26 27 60, mercury contact wires 59 58 29 30 and back to thereproducing-magnet m.

In case the machine has been set at the indicator to be stoppedautomatically thereby at a predetermined point the stopping isaccomplished as follows: As before described, the machine moves the armv; until one of its projections closes the circuit between 6 and Z* onone of the adjustable indexes Z or 0 As the switch p (which determinesthe direction of movement) is in the left-hand position, we will assumethat the left-hand index 0 is set, say, at the point 20 of the scale andthat the machine will run until the projection 2' strikes and closes thecircuit through the index 0 This circuit is a shunt from thepower-circuit which includes the coil t of the locking magnet T, asfollows: beginning at the switch-lever by wire 54, contacts Z, Z, and 0wires 55 56, coil 15 of magnet ,T, wire 57 to the power-circuit at wire14. Thus when this circuit is closed the magnet T is energized andattracts its armature 25, which allows lever s to fall under the actionof its spring and open the power-circuit at the contacts s and s. Thisnot only cuts off power from the motor, but also from the brake-mag net0, which permits the brake to be applied to the motor B and at oncebrings the machine to a stop. This method of stopping by the indicatorcan be accomplished regardless of the direction in which the machine isrunning, for this shunt is closed by the switch in either of itspositions, as shown. If when the machine is running as described it ismerely retracing a portion of the wire to get back to the beginning-of arecord previously made in order to reproduce the same, the speedresistance 11 may be short-circuited by the switch shown adjacentthereto to increase the speed of the motor, and thus save time, and whenretracing the Wire for this purpose 9b,, g-WlllCl] 4) must be either inthe mid-position or to the left, so that the obliterating and polarizingcircuit will be inactive. It is also pointed out here that thereversingswitch when moved to the opposite position not only switchesthe current into the motor B, but throws in brake-magnet c and also theobliterating-magnet m as can be easily traced on the circuits alreadydescribed.

To stop the machine without reversing it, the switch may be thrown tothe mid-position, which obviously opens the power-circuit; but thisswitch is not ordinarily so conveniently used unless it is intended tofollow the stopping by an immediate reversal, in which case theswitch 1) would be thrown entirely over; but for ordinary stopping andstarting, as becomes necessary in dictation, the pushbutton It is used.Assuming now that the machine is running as before and it is desired tostopit, button a is pushed inward and immediately released. This closesa circuit as follows: from contact it by wires 37 36, switch-lever 'w,wires 35 34 33, coil t of locking-magnet T, wires 32 31, recordingmagnetm, wires 30 29 58 59, electrodes 1' and inercury, wires 60 61 62,stopping and starting battery, wires 63 64 to contact n This alsoenergizes magnet T, which attracts its armature-lever 25" and opens thepower-circuit at s s, as before described. \jVhen the powercircuit isopened, relay R is deenergized, allowing the spring to shift theposition of the mercury vessel. This it does at once;'but the mercuryflows so slowly that the electrodes r are not uncovered for anappreciable interval. The branch circuit containing relay S is indicatedby the Wires 27 and 28, which are short-circuited by the wires 58 and60,leading to the mercury-switch. So long as circuit 58 and 60 is closedrelay '5 will'remain dead; but if 58 and 60 were allowed to open at themoment that the power circuit is opened at s and s by the coil 15' therelay S would at that same instant be energized and close thepower-circuit at s and 8*, which would again be opened by the magnet T,and so on, setting up a vibration of the circuitcloser and preventingcontrol of the powercircuit. The same vibration of the contacts "i and swould take placei'f the operator held the push-button down after themercury had uncovered the electrodes '2', for then, obviously, thecircuits of S and T would still be closed; but the function of themercuryswitch is to permit the operator to hold the --circuit of magnetT closed long enough to ob- 5 BEST AVAlLABLE CO circuit: wires 63 64,contacts 11 a, wires 37 36, switch-army), wires 34 65, mercurycontact1", wires 59 58 28, electromagnet S, wires 27, 61, and 62. Hence relayS, which then acts without interference, closes the power-circuit at sand a and the armaturelever 25 drops under lever .v' and looks it. Thepower-circuit being closed, relay R again becomes energized and shiftsthe mercuryswitch, which if the push-button Z63 is released opens theshunt 65 58 around magnet T. The power-circuit will then remain closeduntil the button is again pushed.

From the above description it will be seen that themachine can bestopped and started locally in any one of three ways-to wit, by thepush-buttoned, by the reversing-switchp, and by the indicator.

One of the uses of the telegraphone in conneetion with a regulartelephone system is to receive and record a message in the absence ofthe subscriber. For this purpos the switches p and w are used; but theoperation is not given here, since it is to form the subject of aseparate application.

In order to obliterate any pofilion of the record without simultaneouslymaking a new record, it is only necessary to throw the switch 1) to theright-hand position and run that portion of the wire containing a recordto be effaced through the magnets.

It will be seen that the Within description covers a telegraphone thatmay be used to dietate correspondence or other matter, during which itcan be readily stopped and started. It can be reversed and run to anyportion of the dictated matter and made to repeat to the dictator whathe has said, whereupon all or any portion of the matter dictated can beeffaeed and new matter put in its place.

From a mechanical standpoint a machine of this construction carryingsufficient wire to run continuously in one direction a half-houroccupies considerably less than a cubic foot of space including thedriving-motors, and the capacity can be very greatly enlarged withoutmaterially increasing the size of the machine, since it involves merelythe substitution of larger spools adapted to carry a longer wire.

Running backward at a higher speed than running forward is an advantage,especially when dictating, and the indicator is a great convenience indetermining where the machine is to be stopped in its run backward. Thisis done by making notes as the dictation progresses of the variouspoints on the scale where prominent portions of the dictation begin. Forinstance, in dictating correspondence the position of the index at thebeginning of each letter can be noted and and any letter can then befound by running the machine back to its corresponding position on thescale.

The arrangement of two obliterating-magnets, one each side of therecording-magnet, whereby an old record can be obliteratedsimultaneously with the recording of a new record when running in eitherdirection, has the advantage that it saves the time of obliterating.Having described our invention, we claim 1. In a telegraphone, thecombination of a recording-magnet and a separate obliteratingmagnet, therecording magnet having a polarizing-coil in circuit with theobliteratingmagnet.

2. In a telegraphone, the combination of a recording-body, arecording-magnet applied thereto and two obliterating-magnets, one oneach side of the recording-magnet, for the purpose s'et forth.

3. In a telegraphone, the combination of a recording-body and means formoving the same in either of two directions atwill, a recording-magnetapplied thereto, two obliterating-magnets also applied thereto, one oneach side of the recording-magnet and means for cutting out oneobliterating-magnet and cutting in the other, in accordance with thedirection of movement of the recording-body.

4. In a telegraphone, the combination of two spools upon which therecording-body in the form of a wire or strip is wound, two electricmotors driving the respective spools, a brake for each motor, anelectromagnet adapted to hold the brakes off, looking devices for thebrakes controlled respectively by two electromagnets, a switch andcircuits whereby when the circuit of a given motor is opened, thelocking device corresponding to the other motor is released and itsbrake applied, substantially as described 5. In a machine for recordingand reproducing speech, the combination of a moving body in which therecord is made and an indicator by which the location of various partsof the recorded matter can be determined.

6. In a machine for recording and reproducing speech, the combination ofa moving body in which the record is made, a motor H QEST AVAlLABhECCadapted to drive the same and means whereby the motor can beautomatically stopped when any predetermined point in the moving body isreached.

7. In a telegraphone, the combination of two spools, a recording wire orstrip wound thereon, means for rotating said spools and means for movingsaid spools along their axes in such a way, that by winding upon onespool and unwinding from the other the connectingstrand is constantlymaintained in the same vertical plane.

8,. In a telegraphone, the combination of two spools, a recording-wireadapted to be wound and unwound upon said spools, parallel shafts uponwhich said spools are mounted, and means for reciprocating said spoolsin opposite directions.

9. In a telegraphone, the combination of two spools, a recording-body inthe form of a wire or stripadapted to be wound and unwound upon saidspools, a tilting magnet-carrier located between the spools and havingguides through which said wire passes whereby a relative change in thediameter of said spools can take place without altering the relativepositions of the wire and carrier.

10. In a telegraphone, the combination of two motors, two parallelshafts respectively driven thereby, a spool or drum on each shaft forthe recording wire or strip, two cams and means for driving them fromthe respective motors, and means whereby said cams will cause areciprocation of the spools along their respective axes in oppositedirections.

In witness whereof we subscribe our signatures in presence of twowitnesses.

VALDEMAR POULSEN.

PEDER O. PEDERSEN. CARL SCHOU. Witnesses:

J. HERM. CHRISTENSEN,

J. (1. JACOBSEN.

